Comments by Reza jafery (Top 52 by date)

Of course, if someone provides a comprehensive response, it will be accepted.

For the time being, I consider this question open, that is, without an answer, so that I can do additional study and provide a more full response.

Thank you for your response. I read the article.
Could you list all the items that are designed for parallel processing, such as collections, classes, and...?

In general, I appreciate your advice.

We assume that my technique has no effect on optimization, but the complexity of the code makes the app unreadable, making it more difficult for someone to hack it and therefore increasing the code's security.

The best is yet to come.I use the following facilities as much as possible:1. for loop instead of foreach in sequential operations,2. Parallel.For loop instead of for loop,3. Choosing the best Collections for insertion and deletion,4. switch statement instead of if else and if,5. Accurate choice of variable type,6. I try to use more design languages for design so as not to do it dynamically in C#,7. Unsubscribing from event subscriptions to avoid memory leaks if the event is defined with += event is defined with +=,8. Fastest concatenation of multiple strings in sequence StringBuilder, String.Join and etc,9. Utilization of the Skip(i).Take() method if possible in the for loop,10. Using Database Indexes, 11. Reduce Data Redundancy, And ...

I use this approach when I'm done coding and debugging.

I know that the compiler actually performs this, however, let's say you have a project where 200 variables are momentarily used and then terminated after the application finishes. In such cases, this approach would also be helpful.

Although 16 bytes may appear to be a small amount, when we have a large design with a large number of variables, after debugging we can save a few megabytes by using this approach instead of GC.Collect.

As for why the code is failing, does your app even have a GUID? ... You are exactly right; my app's "AssemblyInfo.cs" needed the following code:

[assembly: Guid( "F6341D4D-5A4D-429F-B587-28CD958B27F2" )]

"What is going to hinder your debugging, ... " It is useful for debugging the app, but once it has been debugged and completed, I prefer to code as shown above (chained) because the fewer variables defined, the less RAM is required.

Thanks for the answer. I know that this collection is empty, but why?

Is it necessary to unsubscribe from "SourceInitialized += New EventHandler(OnSourceInitialized)" to avoid memory leaks?

"screen gymnastics" It was an interesting sentence. 😆😆😆😆😆 :D:D

Thank you for your reply, but I'd like my app to be visually distinct.

Is there any suggestion?

SQL Injection may occur when the user enters the data, but in this case, the numbers are calculated automatically.

Can't anyone help me?

Thank you,
I tested your solution, I got this error:

System.Data.OleDb.OleDbException: 'Operation must use an updateable query.'

I've updated my question.

I've updated my question.

"If someone answers correctly, I will give them 5 stars."
I change it.

I mean 5 stars

Thanks for your tips.
The problem would most likely be solved if there were LINQ equivalents for the following code:

            for (int i = 0; i < UniqueISBN.Length; i++)
            {
                OleDbCommand_Update.CommandText = string.Join(null, "Select Count(*) From BookTable Where ISBN = ", UniqueISBN[i]);
                OleDbCommand_Update.CommandText = string.Join(null, "Update BookTable Set Inventory = ", (int)OleDbCommand_Update.ExecuteScalar(), " Where ISBN = ", UniqueISBN[i]);
                OleDbCommand_Update.ExecuteNonQuery();
            }

Something like this:

            for (int i = 0; i < UniqueISBN.Length; i++)
            {
                int Inventory = BookDataView.Table.AsEnumerable().Count(Row => Row.Field<string>("ISBN") == UniqueISBN[i]);
                EnumerableRowCollection<DataRow> Query = from Row in BookDataView.Table.AsEnumerable() where Row.Field<string>("ISBN") == UniqueISBN[i] select Row;
                foreach (DataRow Row in Query)
                {
                    Row["Inventory"] = Inventory;
                }
                BookDataView = Query.AsDataView();
            }

Again, you are correct. After tinkering with the solutions mentioned above, I finally found the right solution.
I made a strategic mistake. When we connect "DataGrid.ItemsSource" to "DataView" or "CollectionViewSource.Source" for the first time, the values of "DataView" and "CollectionViewSource.Source" change automatically with each change (like insert, edit, and delete), so the code that connects "DataGrid.ItemsSource" to "DataView" or "CollectionViewSource.Source" does not need to be rewritten.Again, you are correct. After tinkering with the solutions mentioned above, I finally found the right solution.
I made a strategic mistake. When we connect "DataGrid.ItemsSource" to "DataView" or "CollectionViewSource.Source" for the first time, the values of "DataView" and "CollectionViewSource.Source" change automatically with each change (like insert, edit, and delete), so the code that connects "DataGrid.ItemsSource" to "DataView" or "CollectionViewSource.Source" does not need to be rewritten. ◉‿◉

Do you think my solution still has problems?
Please see the output of my solution. I tested it.
Do you still believe there could be a problem with the solution I offered?
Thank you for your attention.

Thank you for your time and feedback.
I'll review your response and notify you of the outcome.

Thank you for your feedback.
When I use the "SelectionStart" property, I didn't obtain any results.

OK thank you for your kindness.

It was not a complete solution, but thank you.

I have to do this for my university

I'm not a beginner in C # and I do not want to learn PHP.

If you can answer this question accurately with the code and output, thank you.

Hi, thank you for the feedback but I want to use DataGrid.

Thank you for your attention, please share my answer.

My XAML code work correctly , but in C# event doesn't work and It does not show any errors.
I tested this (Resources["UploadButtonMouseEnter"] as Storyboard).Begin();
But it did not work

I did this and it didn't work.

https://pasteboard.co/JP6CMpt.gif

Dear friend , if all the focus of the window is like the window load time , the problem will be solved ( because in The load event , everything works Properly , but when I click on the button , the focus changes ).

Button codes added ( Look at the codes above ).
I need to run STORYBOARD to make the button look beautiful.

XAML codes added ( Look at the codes above ) .Now what is your solution?

I try this but it didn't work.

If the user needs to update both (texts and image) at the same time, I want my app to have this feature.